Quantification of lamp output quality is, at best, an expensive proposition. However, qualification of spectra is so inexpensive that even the budget-conscious hobbyist can afford a ‘spectrometer’. There are several ‘instruments’ available for just a few dollars from various suppliers.

If you have deep pockets and a true desire to tinker with and know practically everything about your lighting system and then some, then the relatively low-cost spectrometers and accessories from Ocean Optics just might be for you.